491156800 has 84 divisors (see below), whose sum is σ = 1214359776. Its totient is φ = 195520000.

The previous prime is 491156797. The next prime is 491156803. The reversal of 491156800 is 8651194.

It is an interprime number because it is at equal distance from previous prime (491156797) and next prime (491156803).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491156803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 400989 + ... + 402211.

It is an arithmetic number, because the mean of its divisors is an integer number (14456664).

Almost surely, 2^491156800 is an apocalyptic number.

491156800 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 491156800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (607179888).

491156800 is an abundant number, since it is smaller than the sum of its proper divisors (723202976).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

491156800 is a wasteful number, since it uses less digits than its factorization.

491156800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1496 (or 1481 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 34.

The square root of 491156800 is about 22162.0576662006. The cubic root of 491156800 is about 788.9934304213.

The spelling of 491156800 in words is "four hundred ninety-one million, one hundred fifty-six thousand, eight hundred".